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  1.  
  2. import re
  3. text = "Hello. world. Hello!" 
  4. print( re.sub(r'^([^.]*\.[^.]*)\.', r'\1_', text) )
  5.  
Success #stdin #stdout 0.02s 9720KB
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stdin
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Standard input is empty
stdout
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Hello. world_ Hello!
https://ideone.com/FIZeFj
language:
Python 3 (python  3.12)
created:
4 years ago
visibility:
secret

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